I talked to Cary for a half hour on the phone and he is super nice. He was really busy and he still took the time to answer my questions. After talking to him I am more convinced that propane is the way to go. He talked about the turbo kit and that seems like a better option to me rather than spending tons of cash on a crate motor. You will have all the power you need, can use your stock motor and you will be the only one on the trail with a way cool propane and turbo setup. He installed the turbo kit on his 22r with I think 200,000 miles on it from what I remember him saying and has not had a problem. He seems to really care about the customer and strives to provide a quality product. He gets my vote and will get my order when I get the cash.